Profile Projector (HDEF Pro)

A profile projector, also known as an optical comparator or shadowgraph, is a precision optical instrument used for measuring the dimensions of mechanical parts and checking their shapes. It projects an enlarged silhouette or shadow of a part onto a screen, allowing for accurate measurements and inspections. Here are some key features and components of a profile projector:

1. **Optics:** The profile projector uses optical elements such as lenses and mirrors to project the image of the part onto a screen. These optics can provide magnification for detailed inspection.

2. **Light Source:** A profile projector typically includes a light source, often in the form of a halogen lamp or LED, which illuminates the part being measured. The illumination can be adjusted to enhance contrast and highlight specific features.

3. **Stage:** The part to be measured is placed on a stage that can be moved in different directions (X, Y, and sometimes Z) to position the part correctly and facilitate measurements.

4. **Screen:** The projected image of the part is displayed on a glass screen that often has a crosshair or grid for reference. The screen may also have a protractor for angle measurements.

5. **Micrometer or Digital Readout (DRO):** To measure dimensions accurately, profile projectors are equipped with a micrometer or a digital readout system. This allows the user to measure distances directly from the projected image.

6. **Edge Detection:** Some modern profile projectors may have edge detection capabilities using optical or digital methods. This helps in automatically detecting the edges of the part for precise measurements.

7. **Rotary Table:** In some models, a rotary table may be present to easily rotate the part and inspect it from different angles.

8. **Magnification Options:** Profile projectors often offer interchangeable lenses or zoom lenses to provide various levels of magnification for different applications.

Profile projectors are commonly used in manufacturing and quality control environments to measure dimensions, angles, radii, and other geometric features of parts. They are especially useful for inspecting parts with complex shapes or tight tolerances. The measurements taken with a profile projector are typically non-contact, making it suitable for delicate or sensitive components.